CN115877291A - Method and device for decoupling coil of magnetic resonance imaging equipment - Google Patents
Method and device for decoupling coil of magnetic resonance imaging equipment Download PDFInfo
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- CN115877291A CN115877291A CN202111148715.8A CN202111148715A CN115877291A CN 115877291 A CN115877291 A CN 115877291A CN 202111148715 A CN202111148715 A CN 202111148715A CN 115877291 A CN115877291 A CN 115877291A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/365—Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
- G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
Abstract
The present disclosure relates to a method for coil decoupling for a magnetic resonance imaging apparatus. The method comprises the following steps: issuing an instruction to cause the transmitter to transmit a transmission signal; acquiring a receiving signal received by a receiver, wherein the receiving signal is a signal which is transmitted to the receiver after passing through two coils to be adjusted in the plurality of coils; determining a coupling value between the two coils to be adjusted based on the transmission signal and the reception signal; and issuing an instruction to adjust the decoupling component based on the coupling value.
Description
Technical Field
The present disclosure relates to the field of medical equipment technology, in particular to a method, an apparatus, a non-transitory computer readable storage medium and a computer program product for coil decoupling for a magnetic resonance imaging device.
Background
The magnetic resonance imaging device utilizes the nuclear magnetic resonance principle, according to different attenuations of released energy in different substance internal structure environments, and monitors emitted electromagnetic waves through an external gradient magnetic field, so as to obtain the position and the type of atomic nuclei of the substance.
The superconducting magnet is a core component of the magnetic resonance imaging equipment, and a superconducting coil made of superconducting materials is used for generating a magnetic field with high field intensity and high stability. The coils of the current magnetic resonance imaging apparatus mainly adopt the design of array coils, that is, a plurality of coils form a coil array through a specific array arrangement. The coils arranged in the array can generate mutual interference due to the existence of magnetic field coupling. When the coupling degree between the coils is larger than a certain value, certain influence is generated on the efficiency of the coil array and the parallel imaging performance. Therefore, coil decoupling is crucial for magnetic resonance imaging devices.
For magnetic resonance systems, in particular for low-field magnetic resonance systems, coupling phenomena also occur for coils that are far apart from each other due to the high Q-factor of the coils. In addition, the coil coupling may be affected by the load, and the decoupling results are also different under different loads. However, the conventional coil decoupling method cannot achieve a good decoupling effect.
Disclosure of Invention
In view of the above, the present disclosure provides a method for decoupling a coil of a magnetic resonance imaging apparatus, so as to effectively decouple the coil in real time and reduce the influence of factors such as load on the decoupling effect, thereby improving the imaging performance.
According to a first aspect of the present disclosure, there is provided a method for coil decoupling for a magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the method comprising: issuing instructions to cause the transmitter to transmit a transmit signal; acquiring a receiving signal received by the receiver, wherein the receiving signal is a signal which reaches the receiver after the transmitting signal passes through two coils to be adjusted in the plurality of coils; determining a coupling value between the two coils to be adjusted based on the transmission signal and the reception signal; and issuing an instruction to adjust the decoupling component based on the coupling value.
According to a second aspect of the present disclosure, there is provided an apparatus for coil decoupling for a magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the apparatus comprising: a first issuing module configured to issue an instruction to cause the transmitter to send a transmission signal; an obtaining module configured to obtain a receiving signal received by the receiver, wherein the receiving signal is a signal that the transmitting signal reaches the receiver after passing through two coils to be adjusted in the plurality of coils; a determination module configured to determine a coupling value between the two coils to be adjusted based on the transmit signal and the receive signal; and a second issuing module configured to issue an instruction to adjust the decoupling component based on the coupling value.
According to a third aspect of the present disclosure, there is provided an electronic device comprising: a processor, and a memory storing a program comprising instructions which, when executed by the processor, cause the processor to perform a method for coil decoupling for a magnetic resonance imaging device according to the present disclosure.
According to a fourth aspect of the present disclosure, there is provided a non-transitory computer readable storage medium storing a program, the program comprising instructions which, when executed by one or more processors, cause the one or more processors to perform a method for coil decoupling for a magnetic resonance imaging device according to the present disclosure.
According to a fifth aspect of the present disclosure, a computer program product is provided, comprising a computer program which, when being executed by a processor, realizes the steps of the method for coil decoupling for a magnetic resonance imaging device according to the present disclosure.
According to the embodiment of the disclosure, the coupling degree between the coils is calculated based on the transmitting signals and the receiving signals passing through the coils, and the decoupling component in the magnetic resonance equipment is adjusted according to the coupling degree, so that the coils are effectively decoupled in real time, the influence of factors such as load on the decoupling effect is reduced, and the magnetic resonance imaging performance is improved.
Drawings
The above and other features and advantages of the present disclosure will become more apparent to those of ordinary skill in the art by describing in detail embodiments thereof with reference to the attached drawings, in which:
figure 1 is a schematic diagram of a magnetic resonance system for a magnetic resonance imaging apparatus according to some embodiments of the present disclosure;
figure 2 is a flow diagram of a method for coil decoupling for a magnetic resonance imaging device according to some embodiments of the present disclosure;
figure 3 is a schematic diagram of a magnetic resonance system for a magnetic resonance imaging apparatus according to further embodiments of the present disclosure;
FIG. 4 is a schematic diagram of the internal structure of a portion of the coil of FIG. 3;
figure 5 is a flow chart of a method for coil decoupling for a magnetic resonance imaging device according to further embodiments of the present disclosure;
fig. 6 exemplarily shows a relationship between a coupling value between coils and a parameter of a decoupling component;
figure 7 shows a schematic block diagram of an apparatus for coil decoupling for a magnetic resonance imaging device according to some embodiments of the present disclosure; and
fig. 8 illustrates an example configuration of an electronic device that may be used to implement the methods described herein.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present disclosure, embodiments of the present disclosure will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
In this document, "one" means not only "only one" but also a case of "more than one". In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree of importance and order thereof, and the premise that each other exists, and the like.
For magnetic resonance systems, in particular low field magnetic resonance systems, there is also a coupling phenomenon for coils that are far apart from each other due to their high Q factor. In addition, the coil coupling may be affected by the load, and the decoupling results are also different under different loads. The decoupling in the related art is to cancel the magnetic fields in the positive and negative directions using a geometric overlap technique (operating magnetic field overlap) so that the two coils are zero in mutual inductance. Inductive or capacitive decoupling may be used in addition to this. However, the decoupling methods (e.g. geometric overlapping, inductive decoupling, capacitive decoupling, etc.) in the related art are all complex adjustments of parameters of components such as coils, capacitors or inductors during the manufacturing process, and the parameters of the components are fixed after the manufacturing process and cannot be changed along with the change of the load of the magnetic resonance imaging apparatus. The decoupling mode in the related art puts higher requirements on the decoupling design of the coil, increases the difficulty of the coil design, and in addition, the decoupling adjusted in advance is not necessarily applicable to all application scenarios when the magnetic resonance imaging device works due to the difference of the structure of the examined body.
According to the embodiment of the disclosure, the coupling degree between the coils is calculated based on the transmitting signal and the receiving signal passing through the coils, and the decoupling component in the magnetic resonance equipment is adjusted according to the coupling degree, so that the coils are effectively decoupled in real time, the influence of factors such as load on the decoupling effect is reduced, and the magnetic resonance imaging performance is improved.
Exemplary embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Figure 1 is a schematic diagram of a magnetic resonance system 100 for a magnetic resonance imaging apparatus according to some embodiments of the present disclosure. As shown in fig. 1, the magnetic resonance system 100 may include a controller 110, a transmitter 120, a receiver 130, a decoupling component 140, and a plurality of coils (e.g., coil N1 and coil N2), among others. In some embodiments, the magnetic resonance system 100 may further include a plurality of channel selection portions, such as channel selection portions X1 and X2. Wherein the controller 110 is communicatively coupled to the transmitter 120, the receiver 130 and/or the channel selection portion N1, N2 for controlling the operation of the transmitter 120, the receiver 130 and/or the channel selection portion. In this context, a "communication connection" may be a wired connection or a wireless connection for communicating signals, such as control signals, sensing signals, and the like. In some embodiments, the controller 110 may also be communicatively coupled to the decoupling component 140 to control the operation of the decoupling component 140 and various parameters. The decoupling component 140 may be a capacitor (e.g., a voltage-controlled capacitor, etc.), an inductor, a resistor, etc., among others. The decoupling member 140 may be disposed between the coil N1 and the coil N2, and may also be disposed within the coil N1 or the coil N2. In some embodiments, the channel selection portions X1, X2 may be configured to selectively connect or disconnect the corresponding coils N1, N2 from the transmitter 120 or the receiver 130. In some embodiments, the transmitter 120 may selectively send a transmit signal to either coil N1 or coil N2. For example, when the channel selecting part X1 connects the coil N1 to the transmitter 120, the transmitter 120 transmits a transmission signal to the coil N1, and the coil N1 may serve as a transmission coil to transmit the signal transmitted by the transmitter 120. When the channel selection part X2 connects the coil N2 to the receiver 130, the coil N2 may serve as a receiving coil to receive the signal transmitted by the transmitting coil. Further, via control of the channel selection portions X1, X2, the transmitter 120, and the receiver 130 by the controller 110, it is also possible to make the coil N1 a receiving coil and make the coil N2 a transmitting coil.
Figure 2 is a flow diagram of a method 200 for coil decoupling for a magnetic resonance imaging device according to some embodiments of the present disclosure. As shown in fig. 2, the method 200 includes: step S202, sending out an instruction for enabling the transmitter to send a transmitting signal; step S204, obtaining a receiving signal received by the receiver, wherein the receiving signal is a signal which is obtained after a transmitting signal passes through two coils to be adjusted in the plurality of coils and reaches the receiver; step S206, determining a coupling value between two coils to be adjusted based on the transmitting signal and the receiving signal; and step S208, based on the coupling value, sending out an instruction for adjusting the decoupling component.
The various steps in method 200 are described in detail below in conjunction with fig. 1.
In step S202, an instruction to cause the transmitter to transmit a transmission signal is issued.
For example, an instruction to cause the transmitter 120 to send a transmission signal may be issued by the controller 110, and the channel selection portion X1 is controlled by the controller 110 to connect the coil N1 to the transmitter 110 with the coil N1 as a transmission coil. The transmitter 120 sends a transmission signal after receiving an instruction from the controller 110, and the transmission signal is transmitted to the coil N1 via the channel selection part X1 and sent by the coil N1. The frequency of the transmitted signal is generally set to coincide with the frequency of the magnetic resonance signal (e.g., 63.6MHz for a 1.5T system, etc.), so that the transmission efficiency of the entire signal can be ensured.
In step S204, a reception signal received by the receiver is acquired.
For example, the received signal received by the receiver 130 may be acquired by the controller 110. The received signal is a signal that reaches the receiver 130 after the transmitted signal passes through two coils to be adjusted (e.g., the coil N1 and the coil N2). At this time, the channel selection part X2 may be controlled by the controller 110 to connect the coil N2 to the receiver 130. The coil N2 may receive, as a receiving coil, a signal transmitted by the coil N1 as a transmitting coil, and the signal is transmitted to the receiver 130 via the channel selection part X2.
In step S206, a coupling value between the two coils to be adjusted is determined based on the transmission signal and the reception signal.
For example, the controller 110, upon acquiring the transmit signal and the receive signal, may determine a coupling value between two coils to be adjusted (e.g., the coil N1 and the coil N2) based on the transmit signal and the receive signal. This coupling value characterizes the degree of coupling between the two coils to be adjusted (e.g., coil N1 and coil N2).
In step S208, an instruction to adjust the decoupling component is issued based on the coupling value.
For example, the controller 110, upon determining a coupling value between two coils to be adjusted (e.g., coil N1 and coil N2), can issue an instruction to adjust the decoupling component 140 based on the coupling value to adjust a parameter of the decoupling component 140 in real time. Specifically, when the decoupling component 140 is a voltage controlled capacitor, the controller 110 may determine a regulated voltage of the voltage controlled capacitor based on the coupling value and send an instruction containing the regulated voltage to the decoupling component 140. In some embodiments, as shown in fig. 4, decoupling component 140 may be a decoupling component (e.g., capacitor C) disposed between coil N1 and coil N2 d31 ) Therefore, the coil can be decoupled more efficiently and accurately. In other embodiments, the decoupling component 140 can also be an inductor L disposed between the coils N1 and N2 d31 Or is orIt may be a capacitor C in the coils N1, N2 p11 、C p31 Or an inductor L s1 、L s3 Etc., or may also be various combinations of capacitors and inductors between and within the coils N1 and N2, and the disclosure is not limited thereto.
In the above embodiment, the coupling degree between the coils is calculated based on the transmission signal and the reception signal passing through the coils, and the decoupling component in the magnetic resonance apparatus is adjusted according to the coupling degree, so that the coils are effectively decoupled in real time, and the influence of factors such as load on the decoupling effect is reduced, thereby improving the magnetic resonance imaging performance.
In some embodiments, before performing step S202, the method 200 may further include: selecting two coils from the plurality of coils as two coils to be adjusted based on the coupling degree of two adjacent coils in the plurality of coils, wherein one coil to be adjusted in the two coils to be adjusted is a transmitting coil used for receiving a transmitting signal transmitted by a transmitter, and the other coil to be adjusted in the two coils to be adjusted is a receiving coil used for receiving a signal transmitted by the transmitting coil; and issuing instructions to connect the transmitting coil with the transmitter and to connect the receiving coil with the receiver. For example, taking the system shown in fig. 3 as an example, the magnetic resonance imaging system 300 shown in fig. 3 includes a plurality of coils N1, N2 … … Nn and a plurality of channel selection portions X1, X2 … … Xn. The plurality of channel selection sections X1, X2 … … Xn include switches S1, S2 … … Sn and couplers D1, D2 … … Dn, respectively, wherein each of the plurality of couplers D1, D2 … … Dn may include two channels, one for transmitting data when scanning a human body (the channel of the upper row of couplers as shown in fig. 3) and one for transmitting data when performing coil decoupling (the channel of the lower row of couplers as shown in fig. 3). Each time the method 200 is performed, the controller 110 may select two coils with a higher coupling degree, for example, the coil N1 and the coil N2, from the plurality of coils N1, N2 … … Nn as two coils to be adjusted according to the coupling degree of two adjacent coils of the plurality of coils N1, N2 … … Nn. At this time, the controller 110 may issue an instruction to control the switches S1 and S2 of the channel selection portions X1 and X2 of the coil N1 and the coil N2 to be toggled down (i.e., to connect the channels of the couplers D1 and D2 for data transmission when coil decoupling is performed), to control the connection of the transmitter 120 with the channel selection portion X1, and to control the connection of the receiver 130 with the channel selection portion X2. At this time, the coil N1 may serve as a transmitting coil for receiving the transmitting signal transmitted by the transmitter 120, and the coil N2 may serve as a receiving coil for receiving the signal transmitted by the transmitting coil. Therefore, on one hand, two coils with higher coupling degree can be selected to perform decoupling operation, so that the efficiency of the decoupling operation is improved, and the occupation of computing resources is reduced. It should be noted herein that two coils may also be selected from the plurality of coils as the two coils to be adjusted based on the degree of coupling of any two coils of the plurality of coils, and the present disclosure is not limited thereto.
In some embodiments, the method 200 may be performed before each time the magnetic resonance imaging apparatus starts scanning, so that the coils may be decoupled in real time and in a targeted manner according to different application scenarios of the magnetic resonance imaging apparatus (for example, when different parts of a human body are scanned), thereby improving the decoupling effect and increasing the quality of magnetic resonance imaging. For example, the operator of the apparatus may click a corresponding button in the magnetic resonance imaging apparatus before each start of the magnetic resonance imaging apparatus, triggering the execution of the method 200. For another example, the magnetic resonance imaging apparatus may also automatically detect the presence of a subject within the apparatus and automatically perform the method 200 upon detecting the presence of a subject. Specifically, the step S202 of issuing the instruction for causing the transmitter to send the transmission signal may include: determining whether a subject is present within a magnetic resonance imaging apparatus; and in response to determining that the subject is present within the magnetic resonance imaging apparatus, issuing instructions to cause the transmitter to transmit the transmit signal. Therein, the presence of a subject within a magnetic resonance imaging apparatus may be sensed, for example, by a sensor (e.g., a camera, an infrared sensor, etc.). At this time, the controller 110 may receive the sensing signal of the sensor and determine whether the subject is present in the magnetic resonance imaging apparatus based on the sensing signal. It should be noted here that the method 200 may also be performed during a magnetic resonance imaging device scan, or at a fixed time period of each day, and the disclosure is not limited thereto.
In some embodiments, the coupling value between the two coils to be adjusted may be calculated based on parameters such as power, voltage or current of the signal. For example, step S206 may include determining a coupling value between two coils to be adjusted based on a difference between the power of the transmit signal and the power of the receive signal. The coupling value between the coils can be calculated through the power of the signals, and the coupling degree of the coils can be accurately reflected.
In other embodiments, step S206 may include determining a coupling value between two coils to be adjusted based on the transmit signal, the receive signal, and calibration data, wherein the calibration data is determined based on signals from the transmitter to the receiver and not through the plurality of coils. The value calculated from the transmission signal and the reception signal is calibrated by the same signal as the remaining transmission path of the transmission signal when the decoupling operation is performed except that the signal does not pass through the coil, so that the influence of other factors than the coupling of the coil on the calculation of the coupling value is eliminated, and the degree of coupling between the two coils to be adjusted can be determined more accurately. For example, taking the system shown in fig. 1 as an example, the signal for calculating the calibration data directly arrives at the channel selection part X2 after passing through the channel selection part X1 from the transmitter 120, and then is received by the receiver 130. Unlike the transmission path of the transmission signal at the time of the decoupling operation, the transmission path of the signal directly reaches the channel selection section X2 from the channel selection section X1 without passing through the coils N1 and N2.
In some embodiments, the calibration data is determined based on a calibration signal transmitted by the transmitter and a signal corresponding to the calibration signal received by the receiver, and the calibration data is determined in a similar manner to the determination of the coupling value based on the transmitted signal and the received signal, so that the influence of factors other than the coupling of the coils on the calculation of the coupling value is eliminated, and the accuracy of the calculation of the degree of coupling between the coils is improved.
In some embodiments, the calculation of the calibration data may be performed before or during each execution of the method 200, or may be stored in the magnetic resonance imaging apparatus after the calibration data is pre-calculated, and the pre-calculated calibration data is directly recalled each time the method 200 is executed.
Figure 5 is a flow diagram of a method 500 for coil decoupling for a magnetic resonance imaging device according to further embodiments of the present disclosure. The method 500 begins at step S501. The method 500 shown in fig. 5 includes step S502 of issuing an instruction for the transmitter to transmit a transmission signal and step S503 of acquiring a reception signal received by the receiver. The features of steps S502 and S503 in the method 500 are the same as those of steps S202 and S204 in the method 200, and for brevity, are not described again here. The differences of the method 500 from the method 200 will be mainly described below. As shown in fig. 5, determining a coupling value between two coils to be adjusted based on the transmit signal, the receive signal, and the calibration data may include: step S504, acquiring the power of the transmitting signal and the power of the receiving signal; step S505, calculating a first difference value between the power of the transmitting signal and the power of the receiving signal; and step S506, determining a coupling value between the two coils to be adjusted based on the first difference and the calibration data. The coupling degree between the two coils to be adjusted can be accurately reflected by calculating the difference value between the power of the transmitting signal and the power of the receiving signal, so that the decoupling effect of the coils is improved, and the performance of magnetic resonance imaging is improved. It should be understood herein that the coupling value may also be calculated by the voltage or current of the signal, and the disclosure is not limited thereto. It should also be understood that the coupling value between the two coils to be adjusted may also be calculated by the ratio between the powers of the transmit and receive signals, and the disclosure is not limited thereto. In some other embodiments, step S505 may be omitted, i.e. the coupling value between the two coils to be adjusted is directly calculated based on the power of the transmit signal, the power of the receive signal and the calibration data.
In some embodiments, the calibration data is determined based on signals from the transmitter to the receiver without passing through the plurality of coils. For example, taking the system of fig. 1 as an example, a signal for calculating calibration data arrives at the receiver 130 from the transmitter 120 via the channel selection part X1 and the channel selection part X2, and the transmission path of the signal is the same as that of the transmission path of the transmission signal except for passing through the coils N1 and N2.
In some embodiments, the calibration data is determined based on a calibration signal transmitted by the transmitter and a signal corresponding to the calibration signal received by the receiver, and the calibration data is determined in a similar manner to the determination of the coupling value based on the transmitted signal and the received signal, so that the influence of factors other than the coupling of the coils on the calculation of the coupling value is eliminated, and the accuracy of the calculation of the degree of coupling between the coils is improved.
In some embodiments, in calculating the coupling value based on a first difference between the powers of the transmit and receive signals, the calibration data may include a second difference between the power of the calibration signal transmitted by the transmitter and the power of the signal corresponding to the calibration signal received by the receiver, the calibration data being determined in a similar manner to determining the coupling value based on the transmit and receive signals, thereby improving the accuracy of the calculation of the degree of coupling between the coils by eliminating the effect of factors other than the coupling of the coils on the calculation of the coupling value. For example, taking the system shown in fig. 1 as an example, the calibration signal arrives directly from the transmitter 120 via the channel selection part X1 to the channel selection part X2, and is then received by the receiver 130. The calibration data may be a second difference between the power of the calibration signal and the power of the signal arriving at the receiver 130 after the calibration signal has passed through the signal selection portions X1 and X2. In some other embodiments, when calculating the coupling value based on a ratio between the power of the transmitted signal and the power of the received signal, the calibration data may include a ratio between the power of the calibration signal transmitted by the transmitter and the power of the signal corresponding to the calibration signal received by the receiver.
In some embodiments, the calculation of the calibration data may be performed before or during each execution of the method 500, or may be stored in the magnetic resonance imaging apparatus after the calibration data is pre-calculated, and the pre-calculated calibration data is directly recalled each time the method 500 is executed.
In some embodiments, as shown in fig. 5, the step S208 of issuing an instruction to adjust the decoupling component based on the coupling value may include: step S507, determining whether the coupling value is larger than a coupling threshold value; and step S508 of issuing an instruction to adjust the decoupling component in response to determining that the coupling value is greater than the coupling threshold. The coupling threshold may be a specific value, for example, a value set empirically. For example, taking the system of fig. 1 as an example, when the calculated coupling value between the two coils N1 and N2 to be adjusted is greater than the coupling threshold, the controller 110 will issue an instruction to adjust the decoupling component 140. The mode that the decoupling component needs to be adjusted when the coupling value is judged to be larger than the coupling threshold value can improve the decoupling efficiency of the coil and reduce the waste of computing resources.
In some embodiments, after performing steps S507 and S508, the method 500 may further include performing issuing an instruction to cause the transmitter to send the transmission signal in response to determining that the coupling value is greater than the coupling threshold, i.e., returning to performing step S502. Then, steps S503, S504, S505, and the like are sequentially executed. Therefore, when the coupling value is determined to be larger than the coupling threshold value, after the instruction for adjusting the decoupling component is issued, the steps S502, S503, S504 and the like are executed again to determine the coupling degree between the two coils to be adjusted after decoupling, and whether to perform decoupling again is judged based on the coupling degree after decoupling. Therefore, real-time feedback can be obtained in the decoupling process, decoupling can be carried out again according to the feedback, the decoupling step is continuously carried out, and the decoupling effect is increased.
In some embodiments, when the coupling value is determined to be less than or equal to the coupling threshold, the step S512 may be executed. Alternatively, step S208 may include, in addition to steps S507 and S508: step S509, determining whether the coupling value is smaller than the coupling threshold; and step S510 of issuing an instruction to adjust the decoupling component in response to determining that the coupling value is less than the coupling threshold value. And at this point, the method 500 may further include: step S511, in response to determining that the coupling value is smaller than the coupling threshold value, updating the coupling threshold value with the coupling value; and in response to determining that the coupling value is less than the coupling threshold, performing step S502, issuing an instruction to cause the transmitter to transmit a transmit signal. For example, taking the system of fig. 1 as an example, upon determining that the coupling value is less than the coupling threshold, the pre-stored coupling threshold th is updated with the calculated coupling value h1 (i.e., coupling threshold th = h 1), and the controller 110 continues to issue instructions to adjust the decoupling component 140 and to cause the transmitter 120 to transmit a transmit signal. In this way, after the next round of performing steps S502, S503, S504, S505 and S506, it is determined whether the decoupling operation needs to be performed again between the two coils to be adjusted after the decoupling component 140 is adjusted in the previous round (i.e., a command for adjusting the decoupling component 140 is issued) based on the updated coupling threshold th = h 1. This is because it has been found through research that there is a lowest point in the coupling value when the parameters of the decoupling component are within a certain range, and therefore the above-mentioned method is aimed at finding the lowest point of the coupling value through continuous iteration and adjusting the decoupling component by using the parameter of the decoupling component corresponding to the lowest point. As shown in fig. 6 (abscissa indicates the capacitance value of the capacitor and ordinate indicates the coupling value), in a certain range of the capacitance value of the capacitor, when the capacitance value of the capacitor as the decoupling means is adjusted to 27.88pF, the lowest decoupling value of-12.41 dB can be obtained, thereby achieving the best decoupling result. Therefore, the coupling threshold value is dynamically updated according to the decoupling adjustment condition between the coils through continuous iteration, the lowest coupling value is found, and the optimal decoupling effect can be obtained.
In some other embodiments, step S208 may include: determining an adjustment amount of the decoupling component based on the coupling value; and sending the adjustment amount to the decoupling component. For example, taking the system of fig. 3 and 4 as an example, when the decoupling component 140 is a voltage controlled capacitor C d31 The controller 110 may determine the voltage controlled capacitor C based on the coupling value d31 And sends a command containing the regulated voltage to the voltage-controlled capacitor C d31 . Therefore, the decoupling component in the magnetic resonance equipment is adjusted according to the calculated coupling value, so that the coil can be effectively decoupled in real time.
Here, it should be noted that steps and features in the methods 200 and 500 according to the above-described embodiments of the present disclosure may be omitted, replaced with or added to each other equivalently. For example, steps S504, S505, and S506 described in fig. 5 may be added to step S206 described in fig. 2; steps S507, S508, S509, and S510 described in fig. 5 may be added to step S208 described in fig. 2; step S511 depicted in fig. 5 may be appended to method 200 depicted in fig. 2.
Fig. 7 shows a schematic block diagram of an apparatus 700 for coil decoupling for a magnetic resonance imaging device according to some embodiments of the present disclosure. As shown in fig. 7, the apparatus 700 includes a first issuing module 710, an obtaining module 720, a determining module 730, and a second issuing module 740. Wherein the first issuing module 710 is configured to issue an instruction to cause the transmitter to send the transmission signal. The obtaining module 720 is configured to obtain a receiving signal received by the receiver, where the receiving signal is a signal that arrives at the receiver after the transmitting signal passes through two coils to be adjusted in the plurality of coils. The determination module 730 is configured to determine a coupling value between the two coils to be adjusted based on the transmit signal and the receive signal. The second issuing module 740 is configured to issue an instruction to adjust the decoupling component based on the coupling value. By calculating the coupling degree between the coils based on the transmitting signals and the receiving signals passing through the coils and adjusting the decoupling components in the magnetic resonance equipment according to the coupling degree, the coils can be effectively decoupled in real time, the influence of factors such as load on the decoupling effect is reduced, and the magnetic resonance imaging performance is improved.
It should be understood that the various modules of the apparatus 700 shown in fig. 7 may correspond to the various steps in the methods 200 and 500 described with reference to fig. 2 and 5. Thus, the operations, features and advantages described above with respect to methods 200 and 500 apply equally to apparatus 700 and the modules it comprises. Certain operations, features and advantages may not be described in detail herein for the sake of brevity.
According to yet another aspect of the present disclosure, there is provided an electronic device comprising a processor and a memory storing a program, the program comprising instructions which, when executed by the processor, cause the processor to perform the steps according to the method 200 or 500 described above.
According to yet another aspect of the disclosure, there is provided a non-transitory computer readable storage medium storing a program, the program comprising instructions which, when executed by one or more processors, cause the one or more processors to perform the steps in the method 200 or 500 according to the above description.
According to yet another aspect of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps in the method 200 or 500 described above.
Illustrative examples of such computer devices, non-transitory computer-readable storage media, and computer program products are described below in connection with FIG. 8.
Fig. 8 illustrates an example configuration of an electronic device 800 that may be used to implement the methods described herein. The above-described means for coil decoupling for a magnetic resonance imaging device may also be realized in whole or at least in part by the electronic device 800 or a similar device or system.
The electronic device 800 may be a variety of different types of devices, such as a server of a service provider, a device associated with a client (e.g., a client device), a system on a chip, and/or any other suitable computer device or computing system. Examples of electronic device 800 include, but are not limited to: desktop computers, server computers, notebook or netbook computers, mobile devices (e.g., tablet computers, cellular or other wireless phones (e.g., smart phones), notepad computers, mobile stations), and so forth.
The electronic device 800 may include at least one processor 802, memory 804, communication interface(s) 806, display device 808, other input/output (I/O) devices 810, and one or more mass storage devices 812, which may be capable of communicating with each other, such as through a system bus 814 or other suitable connection.
The processor 802 may be a single processing unit or a plurality of processing units, all of which may include single or multiple computing units or multiple cores. The processor 802 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitry, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the processor 802 may be configured to retrieve and execute computer-readable instructions stored in the memory 804, mass storage device 812, or other computer-readable medium, such as program code for an operating system 816, program code for an application 818, program code for other programs 820, and so forth.
A number of program modules may be stored on the mass storage device 812. These programs include an operating system 816, one or more application programs 818, other programs 820, and program data 822, and may be loaded into memory 804 for execution. Examples of such applications or program modules may include, for instance, computer program logic (e.g., computer program code or instructions) to implement the following components/functions: the apparatus 700 (including the first issuing module 710, the obtaining module 720, the determining module 730, and the second issuing module 740), the method 200 (including any suitable steps of the method 200), the method 500 (including any suitable steps of the method 500), and/or further embodiments described herein.
Although illustrated in fig. 8 as being stored in memory 804 of computer device 800, modules 816, 818, 820, and 822, or portions thereof, may be implemented using any form of computer-readable media that is accessible by computer device 800. As used herein, "computer-readable media" includes at least two types of computer-readable media, namely computer storage media and communication media.
Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information for access by a computer device.
In contrast, communication media may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism. Computer storage media, as defined herein, does not include communication media.
The electronic device 800 may also include one or more communication interfaces 806 for exchanging data with other devices, such as over a network, direct connection, and so forth, as previously discussed. Such communication interfaces may be one or more of the following: any type of network interface (e.g., a Network Interface Card (NIC)), wired or wireless (such as IEEE 802.11 Wireless LAN (WLAN)) wireless interface, global microwave access interoperability (Wi-MAX) interface, ethernet interface, universal Serial Bus (USB) interface, cellular network interface, bluetooth interface, near Field Communication (NFC) interface, and the like. The communication interface 806 may facilitate communication within a variety of networks and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, and so forth. The communication interface 806 may also provide for communication with external storage devices (not shown), such as in storage arrays, network attached storage, storage area networks, and the like.
In some examples, a display device 808, such as a monitor, may be included for displaying information and images to a user, such as to display reminder information that coil decoupling is being performed, that coil decoupling is complete, and so forth. Other I/O devices 810 may be devices that receive various inputs from and provide various outputs to a user, and may include touch input devices, gesture input devices, cameras, keyboards, remote controls, mice, printers, audio input/output devices, and so forth.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Claims (16)
1. A method of coil decoupling for a magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the method comprising:
sending an instruction to cause the transmitter to send a transmission signal;
acquiring a receiving signal received by the receiver, wherein the receiving signal is a signal which reaches the receiver after the transmitting signal passes through two coils to be adjusted in the plurality of coils;
determining a coupling value between the two coils to be adjusted based on the transmission signal and the reception signal; and
based on the coupling value, an instruction is issued to adjust the decoupling component.
2. The method of claim 1, wherein determining a coupling value between the two coils to be adjusted based on the transmit signal and the receive signal comprises:
determining a coupling value between the two coils to be adjusted based on the transmit signal, the receive signal, and calibration data, wherein the calibration data is determined based on signals from the transmitter to the receiver without passing through the plurality of coils.
3. The method of claim 2, wherein the calibration data is determined based on a calibration signal transmitted by the transmitter and a signal corresponding to the calibration signal received by the receiver.
4. The method of claim 2, wherein determining a coupling value between the two coils to be adjusted based on the transmit signal, the receive signal, and calibration data comprises:
acquiring the power of the transmitting signal and the power of the receiving signal;
calculating a first difference between the power of the transmit signal and the power of the receive signal; and
determining a coupling value between the two coils to be adjusted based on the first difference and the calibration data.
5. The method of claim 4, wherein the calibration data comprises a second difference between a power of a calibration signal transmitted by the transmitter and a power of a signal received by the receiver corresponding to the calibration signal.
6. The method of claim 1, wherein issuing an instruction to adjust the decoupling component based on the coupling value comprises:
determining whether the coupling value is greater than a coupling threshold; and
in response to determining that the coupling value is greater than the coupling threshold, issuing an instruction to adjust the decoupling component.
7. The method of claim 6, further comprising:
in response to determining that the coupling value is greater than the coupling threshold, performing the issuing of the instruction to cause the transmitter to send a transmit signal.
8. The method of claim 6, wherein issuing an instruction to adjust the decoupling component based on the coupling value further comprises issuing an instruction to adjust the decoupling component in response to determining that the coupling value is less than the coupling threshold, and
the method also includes, in response to determining that the coupling value is less than the coupling threshold, updating the coupling threshold with the coupling value, and executing the issuing the instruction to cause the transmitter to send a transmit signal.
9. The method of claim 1, wherein issuing an instruction to adjust the decoupling component based on the coupling value comprises:
determining an adjustment amount of the decoupling component based on the coupling value; and
sending the adjustment amount to the decoupling component.
10. The method according to any one of claims 1 to 9, wherein the decoupling component is a decoupling component arranged between the two coils to be tuned.
11. The method of any one of claims 1 to 9, wherein issuing an instruction to cause the transmitter to transmit a transmission signal comprises:
determining whether a subject is present within the magnetic resonance imaging apparatus; and
in response to determining that the subject is present within the magnetic resonance imaging device, instructions are issued to cause the transmitter to transmit a transmit signal.
12. The method of any of claims 1-9, further comprising:
selecting two coils from the plurality of coils as the two coils to be adjusted based on the coupling degree of two adjacent coils in the plurality of coils, wherein one coil to be adjusted in the two coils to be adjusted is a transmitting coil for receiving a transmitting signal transmitted by the transmitter, and the other coil to be adjusted in the two coils to be adjusted is a receiving coil for receiving a signal transmitted by the transmitting coil; and
issuing instructions to connect the transmit coil with the transmitter and to connect the receive coil with the receiver.
13. An apparatus for coil decoupling for a magnetic resonance imaging device comprising a transmitter, a receiver, a decoupling component and a plurality of coils, the apparatus comprising:
a first issuing module configured to issue an instruction to cause the transmitter to send a transmission signal;
an obtaining module configured to obtain a receiving signal received by the receiver, wherein the receiving signal is a signal that the transmitting signal reaches the receiver after passing through two coils to be adjusted in the plurality of coils;
a determination module configured to determine a coupling value between the two coils to be adjusted based on the transmit signal and the receive signal; and
a second issuing module configured to issue an instruction to adjust the decoupling component based on the coupling value.
14. An electronic device, comprising:
a processor, and
a memory storing a program comprising instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1 to 12.
15. A non-transitory computer-readable storage medium storing a program, the program comprising instructions that when executed by one or more processors cause the one or more processors to perform the method of any one of claims 1-12.
16. A computer program product comprising a computer program which, when executed by a processor, carries out the steps of the method of any one of claims 1 to 12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111148715.8A CN115877291A (en) | 2021-09-29 | 2021-09-29 | Method and device for decoupling coil of magnetic resonance imaging equipment |
| US17/955,821 US20230094917A1 (en) | 2021-09-29 | 2022-09-29 | Coil Decoupling for Magnetic Resonance Imaging |
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| CN202111148715.8A CN115877291A (en) | 2021-09-29 | 2021-09-29 | Method and device for decoupling coil of magnetic resonance imaging equipment |
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| US5483158A (en) * | 1993-10-21 | 1996-01-09 | The Regents Of The University Of California | Method and apparatus for tuning MRI RF coils |
| JP2016501601A (en) * | 2012-12-20 | 2016-01-21 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Automated decoupling of RF receiver coil elements |
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